I had provisionally identified the Margaret Clarke as widow of Henry Clark and dau of adam Corlett + Margt Christian (bapt Ger 1768-10-23)
the fam with Henry consisting of 3 sons Thomas Ger 18030119, john Ger 18050403 and a large gap George Ger 18140605 (? if gap was due to Henry in services - I couldn't find henry corlett mentioned in the 1814 german census) - I think Henry bur Ger 24 Jan 1836 age 65;

The gap between Jane and margaret if they are sisters is I think too large for the same mother - thus possibly a second wife but I had placed Adam as being buried Ger 23 Dec 1776

I havn't yet researched the wills for this period but there does not appear to be one for that adam

The Jane and the 12 yr old margt I too havn't placed - there doesn't appear to be an obv bapt for the younger Margaret that I have found unles d/o John Clarke + Joanna Martin Ger 18300801 (there is another child of this couple but no marriage )